Steam-turbine.



Wl R. HOL-LIDAY.

.STEAM TURBINE.

APPLICATION FILED APR. B. 1918.

Parentedsept. 3,1918.

UNITE WILLIAM It. HOLLIDAY, or GUELPH, ONTARIO, CANADA.

STEAM-TURBIN'E.

specificatin of Letters Patent.

Patented Sept. 3, 1918.

Application led April 8, 1918. Serial No. 227,318.

This invention relates to steam turbines of the impact type, and my object is to devise a turbine of this type which will utilize to the greatest possible extent the energy of the steam without using stationary blades or fixed buckets of any kind.

I attain my object by means of the constructions hereinafter more specifically described' and illustrated in the accompanying drawings in whichl- I Figure 1 is a front elevation, partly in section, of my improved steam turbine;

Fig. 2 a rear elevation of the same; and

Fig. 3 a development of part of the rim of the rotor of the turbine showing the specific arrangement of the buckets.

In the drawings like numerals of reference.

indicate corresponding parts in the diferent figures.

l is the rotor of an impact steam turbine. In the rim of the rotor adjacent one edge are milled a series of groups of buckets 2. substantially semi circular in form. These buckets are milled on chords of arcs of the circumference of the rotor as shown particularly in Fig. 1. rIhe groups of buckets are separated by partitions 3, and each bucket series communicates with a steam passage I extending circumferentially of the rim. These passages are completely separated by the partitions 3 so that the escape of steam from each passage must be through one of the larger curved buckets 5 which extend each from one of the steam passages aforesaid across the rim of the rotor and through its face at the discharge side.

The buckets 5 are preferably cut as shown, the depth of each at any point in its length being approximately radial of the rotor. The cross sectional area of each of the buckets 5 is increased from the inlet to the exhaust end, so as to avoid back pressure due to the decreasing velocity of the steam. Preferably this increase in cross sectional area is obtained by gradually increasing the depth of the bucket toward its opening through the face of the rim of the rotor.

The expanding nozzles 6 may, as in other turbines of this type, be more than one in number, preferably one for each group of buckets 2, and fed from a common annular steam passage 7.

Various advantages follow from my particular construction. "Ihere are no fixed buckets or stationary blades as in turbines of the Curtis or Parsons type and much frictional loss is avoided. All the steam is led clear through to the outer side of the wheel so that the rotor does not rotate in the exhaust steam as is apt to be the case with other types of impact turbines.

What I claim as my invention is 1. A rotor for a steam turbine comprising a circular disk having a series of groups of curved buckets formed in its rim at one side, each lying in the chord of an arc of the circumference of the disk; a circumferentially extending steam passage for each group of buckets with which each bucket of the group communicates at its inner end; and a series of curved buckets, one extending from each of the steam passages aforesaid across the rim of the rotor and opening through the face of the rotor at the exhaust side.

2. A rotor for a steam turbine comprising a circular disk having a series of groups of curved buckets formed in its rim at one side, each lying in the chord of an arc of the circumference of the disk; a circumferentially extending steam passage for each group of buckets with which each bucket of the group communicates at its iimer end; and a series of curved buckets, one extending from each of the steam passages aforesaid across the rim ofthe rotor and opening through the face of the rotor at the exhaust side, said buckets increasing in cross sectional area from their inlet to their exhaust ends.

3. A rotor for a steam turbine comprising a circular disk having a series of groups of curved buckets formed in its rim at one side, each lying in the chord of an arc of the circumference of the disk; a circumferentially extending steam passage for each group of buckets with which each bucket of the group communicates at its inner end; and a series Signed at city of Guelph this 26th day of of curved buckets, one extending from each March, 1918. of the steam passages aforesaid across the rim of the rotor and opening through the WILLIAM R' HOLLIDAY 5 face of the rotor at the exhaust side, said Witnesses:

buckets increasing in depth from their inlet TRUDALE HOLLIDAY,

to their exhaust ends. SAMUEL TOVELL.

Copies of this patent may be obtained for ve neusgaten, by addressing the Commissioner of Patents, Washington, I). C. 

